Ni-based alloy improved in oxidation-resistance, high temperature strength and hot workability

a technology of ni-based alloys and high temperature strength, applied in the field of ni-based alloys, can solve the problems of surface cracks or fractures, deterioration of grain boundary strength, etc., and achieve the effects of improving oxidation resistance, high temperature strength and hot workability

Inactive Publication Date: 2005-02-08
HITACHI METALS LTD
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  • Claims
  • Application Information

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Benefits of technology

The present invention is a Ni-based alloy improved in oxidation-resistance, high temperature strength and hot workability

Problems solved by technology

However, containing one or more of Nb, Ta and V causes an increase in resistance to deformation of the matrix compared to a Ni-based alloy that do

Method used

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  • Ni-based alloy improved in oxidation-resistance, high temperature strength and hot workability
  • Ni-based alloy improved in oxidation-resistance, high temperature strength and hot workability

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By means of vacuum melting, each ingot of 10 kg (W:90 mm×L:90 mm×H) was cast from the melt of each alloy, and the ingot was hot forged into a bar of W:26 mm×T:26 mm×L( for No. 3), W:29 mm×T:29 mm×L(for No. 4), W:30 mm×T:30 mm×L(for Nos. 1, 2, 5-33, 35, 36 and 38), W:40 mm×T:40 mm×L(for No. 34) and W:52 mm×T:52 mm×L(for No. 37), respectively, and thereafter the forged bars were subjected to a solution treatment for 1 hour at 950° C. and air cooled. Appearance of cracks in the forged bars was confirmed to evaluate hot workability.

After heat treating the bars under a high temperature environment (for 50 hours at 1050° C. in air) in which the austenite grains grew, the grain size number (ASTM number) was investigated. The results are shown in TABLE 3 to be described later.

The chemical compositions are shown in TABLE 1. Specimen Nos. 1 to 23 in TABLE 1 represent the alloys of the present invention, and specimen Nos. 30 to 38 in TABLE 2 represent comparative alloys. Also, modified Alloy 6...

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Abstract

A nickel-based alloy is provided for provide parts and members of improved oxidation-resistance and high temperature strength for use in an oxidation atmosphere at high temperatures, such as automobile parts including an electrode for an ignition plug, power plant facility parts including a gas turbine nozzle, inner parts of heat treat furnaces, and fuel cell parts. The alloy improved in oxidation-resistance, high temperature strength and hot workability consists essentially of, in mass percentage, C: 0.003 to 0.1%, Si: 1.0% or less, Mn: 2.0% or less, Cr: 12 to 32%, Fe: 20% or less, Mg: 0.001 to 0.04%, at least one element, of not more than 2.5% in total, selected from the group consisting of Nb, Ta and V, impurity elements of S: 0.01% or less, but the ratio of the Mg-content to the S-content (Mg/S) being 1 or more, and Ti: 0 inclusive to 0.02%, and the rest being Ni and incidental impurities.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a Ni-based alloy improved in oxidation-resistance, high temperature strength and hot workability, which alloy is suitable for making parts and members used at high temperatures exposed to an oxidation atmosphere, including automobile parts such as ignition plug electrodes, power plant facility's parts such as gas turbine nozzles, inner parts of heat treatment furnaces, and fuel cell's parts.2. Description of the Related ArtConventionally, a Ni-18Cr-7Fe alloy (Alloy 600), which has a high oxidation-resistance, has been used for parts which are exposed in an oxidation atmosphere at high temperatures. Oxidation-resistance of a material is required to prevent volume loss or embrittlement of the material due to oxidation while being used at high temperature in air or gas atmosphere. The oxidation-resistance of Alloy 600 is maintained because a Cr2O3 layer is formed on its surface at a high temperature th...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/053C22C19/055C22F1/10C22C19/058C22C19/056
Inventor KUBOTA, SATOSHIUEHARA, TOSHIHIROYAMAGUCHI, MOTOITOJI, AKIHIRO
Owner HITACHI METALS LTD
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